// Copyright (c) 2010, SMB SAAS Systems Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// - Redistributions of source code must  retain  the  above copyright notice, this
//   list of conditions and the following disclaimer.
//
// - Redistributions in binary form  must  reproduce the  above  copyright  notice,
//   this list of conditions  and  the  following  disclaimer in  the documentation
//   and/or other materials provided with the distribution.
//
// - Neither  the  name  of  the  SMB SAAS Systems Inc.  nor   the   names  of  its
//   contributors may be used to endorse or  promote  products  derived  from  this
//   software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,  BUT  NOT  LIMITED TO, THE IMPLIED
// WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR  PURPOSE  ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL,  SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER  CAUSED AND ON
// ANY  THEORY  OF  LIABILITY,  WHETHER  IN  CONTRACT,  STRICT  LIABILITY,  OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING  IN  ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace dotPanel.Installer.Common
{

	/// <summary>
	/// File utils.
	/// </summary>
	internal sealed class FileUtils
	{
		/// <summary>
		/// Initializes a new instance of the class.
		/// </summary>
		private FileUtils()
		{
		}

		/// <summary>
		/// Creates drectory with the specified directory.
		/// </summary>
		/// <param name="path">The directory path to create.</param>
		internal static void CreateDirectory(string path)
		{
			string dir = Path.GetDirectoryName(path);
			if(!Directory.Exists(dir))
			{
				// create directory structure
				Directory.CreateDirectory(dir);
			}
		}

		/// <summary>
		/// Saves file content.
		/// </summary>
		/// <param name="fileName">File name.</param>
		/// <param name="content">The array of bytes to write.</param>
		internal static void SaveFileContent(string fileName, byte[] content)
		{
			FileStream stream = new FileStream(fileName, FileMode.Create);
			stream.Write(content, 0, content.Length);
			stream.Close();
		}

        /// <summary>
        /// Saves file content.
        /// </summary>
        /// <param name="fileName">File name.</param>
        /// <param name="content">The array of bytes to write.</param>
        internal static void AppendFileContent(string fileName, byte[] content)
        {
            FileStream stream = new FileStream(fileName, FileMode.Append, FileAccess.Write);
            stream.Write(content, 0, content.Length);
            stream.Close();
        }

		/// <summary>
		/// Deletes the specified file.
		/// </summary>
		/// <param name="fileName">The name of the file to be deleted.</param>
		internal static void DeleteFile(string fileName)
		{
			int attempts = 0;
			while (true)
			{
				try
				{
					DeleteFileInternal(fileName);
					break;
				}
				catch (Exception)
				{
					if (attempts > 2)
						throw;

					attempts++;
					System.Threading.Thread.Sleep(1000);
				}
			}
		}

		/// <summary>
		/// Deletes the specified file.
		/// </summary>
		/// <param name="fileName">The name of the file to be deleted.</param>
		private static void DeleteReadOnlyFile(string fileName)
		{
			FileInfo info = new FileInfo(fileName);
			info.Attributes = FileAttributes.Normal;
			info.Delete();
		}

		/// <summary>
		/// Deletes the specified file.
		/// </summary>
		/// <param name="fileName">The name of the file to be deleted.</param>
		private static void DeleteFileInternal(string fileName)
		{
			try
			{
				File.Delete(fileName);
			}
			catch (UnauthorizedAccessException)
			{
				DeleteReadOnlyFile(fileName);
			}
		}

		/// <summary>
		/// Deletes the specified directory.
		/// </summary>
		/// <param name="directory">The name of the directory to be deleted.</param>
		internal static void DeleteDirectory(string directory)
		{
			if (!Directory.Exists(directory))
				return;

			// iterate through child folders
			string[] dirs = Directory.GetDirectories(directory);
			foreach (string dir in dirs)
			{
				DeleteDirectory(dir);
			}

			// iterate through child files
			string[] files = Directory.GetFiles(directory);
			foreach (string file in files)
			{
				DeleteFile(file);
			}

			//try to delete dir for 3 times
			int attempts = 0;
			while (true)
			{
				try
				{
					DeleteDirectoryInternal(directory);
					break;
				}
				catch (Exception)
				{
					if (attempts > 2)
						throw;

					attempts++;
					System.Threading.Thread.Sleep(1000);
				}
			}
		}

		/// <summary>
		/// Deletes the specified directory.
		/// </summary>
		/// <param name="directory">The name of the directory to be deleted.</param>
		private static void DeleteDirectoryInternal(string directory)
		{
			try
			{
				Directory.Delete(directory);
			}
			catch (IOException)
			{
				DeleteReadOnlyDirectory(directory);
			}
		}

		/// <summary>
		/// Deletes the specified directory.
		/// </summary>
		/// <param name="directory">The name of the directory to be deleted.</param>
		private static void DeleteReadOnlyDirectory(string directory)
		{
			DirectoryInfo info = new DirectoryInfo(directory);
			info.Attributes = FileAttributes.Normal;
			info.Delete();
		}

		/// <summary>
		/// Determines whether the specified file exists.
		/// </summary>
		/// <param name="fileName">The path to check.</param>
		/// <returns></returns>
		internal static bool FileExists(string fileName)
		{
			return File.Exists(fileName);
		}

		/// <summary>
		/// Determines whether the given path refers to an existing directory on disk.
		/// </summary>
		/// <param name="path">The path to test.</param>
		/// <returns></returns>
		internal static bool DirectoryExists(string path)
		{
			return Directory.Exists(path);
		}
		
		/// <summary>
		/// Returns current application path.
		/// </summary>
		/// <returns>Curent application path.</returns>
		internal static string GetCurrentDirectory()
		{
			return AppDomain.CurrentDomain.BaseDirectory;
		}

		/// <summary>
		/// Returns application temp directory.
		/// </summary>
		/// <returns>Application temp directory.</returns>
		internal static string GetTempDirectory()
		{
			return Path.Combine(GetCurrentDirectory(), "Tmp");
		}

		/// <summary>
		/// Returns application data directory.
		/// </summary>
		/// <returns>Application data directory.</returns>
		internal static string GetDataDirectory()
		{
			return Path.Combine(GetCurrentDirectory(), "Data");
		}

		/// <summary>
		/// Deletes application temp directory.
		/// </summary>
		internal static void DeleteTempDirectory()
		{
			try
			{
				DeleteDirectory(GetTempDirectory());
			}
			catch (Exception ex)
			{
				Log.WriteError("IO Error", ex);
			}
		}
	}
}
